A.碳素結構鋼 B.優(yōu)質碳素結構鋼 C.低合金高強度結構鋼 D.高合金高強度結構鋼
A.8% B.10% C.12% D.15%
A.適筋梁鋼筋 B.超筋梁鋼筋 C.少筋梁鋼筋 D.箍筋梁鋼筋